A type of anti-vibration fastener

Abstract

This utility model relates to the field of fastener technology and discloses an anti-vibration fastener, comprising: a screw, a first nut and a second nut on the outer side of the screw, a bottom washer on the top of the second nut, a recess on the top of the bottom washer, a rubber seat inside the recess, a flat washer on the top of the recess, a spring washer on the top of the flat washer, and a glue storage groove on the inner wall of the rubber seat. The glue storage groove has a glue outlet on the threaded side of the screw. The alternating load generated by vibration is dissipated step by step through the elastic deformation of the rubber seat, the buffering of the rubber pad, and the rebound of the spring washer, which greatly reduces the impact force transmitted to the thread contact surface, reduces thread wear and stress concentration. During the compression of the rubber seat, the glue storage groove inside releases thread glue and solidifies, solving the problem of the decay of the anti-loosening effect of traditional fasteners over time, and significantly improving the service life and operational reliability of fasteners under long-term vibration environment.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically to an anti-vibration fastener. Background Technology

[0002] Fasteners are standardized basic components used in the fields of mechanical manufacturing and engineering to connect, fix, position or lock components. Their core function is to assemble two or more separate parts into a stable whole. At the same time, they can achieve detachable and adjustable connection effects as needed. They are widely used in fields such as construction engineering, industrial equipment, and transportation facilities.

[0003] For example, an existing Chinese patent (CN219712002U) discloses a bolt fastener, including a nut with a cross-shaped groove and a threaded rod. The threaded rod includes a fixed screw and an extension screw movably connected to the fixed screw via a connecting structure. The connecting structure includes a connecting block and a square post. The connecting block is fixed to the extension screw and inserted into the fixed screw, and the connecting block is vertically connected to the fixed screw and can rotate. When the connecting block is positioned, the square post is inserted and positioned at the corresponding position on the fixed screw and the connecting block. This application uses the connection and sliding of the connecting block within the fixed screw to extend the extension screw relative to the fixed screw, and further positions it via the square post, thereby increasing the overall length of the threaded rod. This adapts to situations where longer bolt lengths are required in actual working conditions, improving the practicality of the bolt fastener.

[0004] In some applications with continuous vibration and impact loads, existing bolt fasteners are susceptible to alternating loads caused by vibration. The threaded contact surfaces are prone to relative slippage, which leads to a gradual decrease or even loss of preload, ultimately causing the connection to loosen and separate. Utility Model Content

[0005] The purpose of this invention is to provide an anti-vibration fastener to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an anti-vibration fastener, comprising: a screw, a first nut and a second nut on the outer side of the screw, a bottom washer on the top of the second nut, a recess on the top of the bottom washer, a rubber seat inside the recess, a flat washer on the top of the recess, a spring washer on the top of the flat washer, a glue storage groove on the inner wall of the rubber seat, a glue outlet on the threaded side of the glue storage groove near the screw, and a first washer, a second washer and a third washer between the recess and the outer wall of the rubber seat.

[0007] Furthermore, the bottom gasket is provided with retaining rings around its perimeter, the tray is hemispherical in shape, the bottom of the tray is provided with a flange, and the bottom flange of the tray is in contact with the top surface of the bottom gasket.

[0008] Furthermore, the top of the tray has a through hole for the screw to pass through.

[0009] Furthermore, the rubber seat is a frustum-shaped structure with a small top diameter and a large bottom diameter. The bottom of the rubber seat is provided with a rubber flange, which is in contact with the top surface of the bottom gasket.

[0010] Furthermore, the top of the rubber seat is in contact with the inner wall of the top of the tray, and a through hole for the screw to pass through is provided in the center of the rubber seat.

[0011] Furthermore, the diameters of the first washer, the second washer, and the third washer increase sequentially.

[0012] Furthermore, the glue storage tank is filled with thread-locking adhesive, and the glue outlet is connected to the glue storage tank. Both the glue storage tank and the glue outlet are arranged in a ring shape inside the rubber seat.

[0013] Furthermore, there are multiple rubber storage tanks, which are arranged vertically at equal intervals inside the rubber seat.

[0014] Furthermore, a rubber pad is provided on the outer wall of the top of the tray, the inner wall of the rubber pad is in contact with the outer wall of the tray, and the top surface of the rubber pad is higher than the top surface of the tray.

[0015] Furthermore, the first nut and the second nut are of the same specifications and model, and the threaded rings of the first nut and the second nut are provided with nylon sleeves.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention utilizes the reverse preload of double nuts to form a basic anti-loosening structure. A nylon sleeve is placed inside the nut to fill the thread gap, increasing frictional resistance and suppressing relative rotation of the threads. A multi-layered vibration energy absorption system is constructed through the frustum-shaped structure of the rubber seat, the hemispherical shell design of the concave plate, and the flexible buffering of the rubber pad. The alternating load generated by vibration is dissipated step by step through the elastic deformation of the rubber seat, the buffering of the rubber pad, and the rebound of the spring washer, significantly reducing the impact force transmitted to the thread contact surface, reducing thread wear and stress concentration. During the compression of the rubber seat, the internal glue reservoir releases thread-locking adhesive, which, after curing, irreversibly bonds the threads of the screw and nut, preventing slippage and avoiding the gradual attenuation of preload due to vibration. This solves the problem of the traditional fastener's anti-loosening effect decaying over time, significantly improving the service life and operational reliability of fasteners under long-term vibration environments.

[0018] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0019] Figure 1This is a perspective view of an anti-vibration fastener according to the present invention;

[0020] Figure 2 This is an exploded view of an anti-vibration fastener according to the present invention;

[0021] Figure 3 This is a front sectional view of an anti-vibration fastener according to the present invention;

[0022] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0023] Figure 5 This is another perspective view of the anti-vibration fastener of this utility model;

[0024] Figure 6 This is a front view of an anti-vibration fastener according to the present invention;

[0025] Figure 7 This is a perspective view of another type of anti-vibration fastener according to the present invention.

[0026] In the diagram: 1. Screw; 2. First nut; 3. Second nut; 4. Spring washer; 5. Bottom washer; 6. Dial plate; 7. Flat washer; 8. Rubber pad; 9. Rubber seat; 10. First washer; 11. Second washer; 12. Third washer; 13. Glue reservoir; 14. Glue outlet. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Please see Figures 1-7 This utility model provides a technical solution: an anti-vibration fastener, including: a screw 1, with a first nut 2 and a second nut 3 on the outside of the screw 1. The screw 1 serves as the core load-bearing component, providing a connection foundation for the entire fastener; the first nut 2 and the second nut 3 form a double-nut locking structure, which counteracts the loosening tendency caused by vibration through bidirectional preload.

[0029] The second nut 3 has a bottom washer 5 on top, the bottom washer 5 has a recess 6 on top, the recess 6 has a rubber seat 9 inside, the recess 6 has a flat washer 7 on top, the flat washer 7 has a spring washer 4 on top, the bottom washer 5, the flat washer 7 and the spring washer 4 form a multi-layer buffer pressure bearing system, the recess 6 provides an installation cavity for the rubber seat 9 and transmits the load, and the rubber seat 9 absorbs vibration energy using its own elasticity.

[0030] The inner wall of the rubber seat 9 has a glue storage tank 13, and a glue outlet 14 is opened on the threaded side of the glue storage tank 13 near the screw 1. A first washer 10, a second washer 11, and a third washer 12 are provided between the concave plate 6 and the outer wall of the rubber seat 9. The thread-locking glue stored in the glue storage tank 13 can overflow to the threaded surface of the screw 1 through the glue outlet 14. The first washer 10, the second washer 11, and the third washer 12 form a radial limiting structure through their size differences, which restricts the lateral displacement of the concave plate 6 and the rubber seat 9.

[0031] The bottom gasket 5 is surrounded by retaining rings, and the tray 6 is hemispherical in shape with a flange at its bottom, which fits snugly against the top surface of the bottom gasket 5. The retaining rings around the bottom gasket 5 form an axial limiting space to prevent the upper component from sliding along the edge of the bottom gasket 5. The hemispherical structure of the tray 6 can be adapted to the shape of the rubber seat 9, while the spherical curvature disperses the radial force during vibration. The flange at the bottom of the tray 6 increases the contact area with the bottom gasket 5, transferring the load through surface contact and avoiding pressure concentration caused by point contact. The hemispherical tray 6 improves the ability to disperse vibration loads and reduces the risk of localized damage. The flange fit design enhances the connection stability between the bottom gasket 5 and the tray 6, preventing separation of the mating surfaces during vibration, ensuring the continuity of load transfer, and further suppressing the attenuation of preload.

[0032] The top of the tray 6 has a through hole for the screw 1 to pass through. This through hole provides a passage for the screw 1, ensuring it can pass completely through the tray 6. This allows the upper flat washer 7, spring washer 4, and lower nut to be assembled sequentially along the axis of the screw 1, forming a complete axially loaded structure. This ensures the screw 1 provides through-restraint to all components, preventing components from detaching from the screw 1 during vibration. It provides a fundamental guarantee for the coaxiality and stability of the overall structure, reducing the risk of thread slippage caused by assembly deviations.

[0033] The rubber seat 9 is a frustum-shaped structure with a small top diameter and a large bottom diameter. A rubber flange is located at the bottom of the rubber seat 9, and this flange is in contact with the top surface of the bottom gasket 5. The frustum-shaped structure of the rubber seat 9 allows it to generate radial elastic deformation through its conical surface when subjected to axial vibration loads, converting axial vibration energy into elastic deformation energy. The bottom rubber flange increases the contact area with the bottom gasket 5, and the flexible properties of the rubber material buffer vibration impacts. Simultaneously, the flange's close fit design prevents the rubber seat 9 from tipping over or shifting during vibration. The frustum-shaped structure enhances the deformation resistance and energy absorption efficiency of the rubber seat 9, effectively reducing the impact of alternating loads on the threads of the screw 1. The rubber flange strengthens the connection stability with the bottom gasket 5, and the flexible fit reduces hard collisions during vibration, lowering component wear. It also further blocks the transmission of vibration energy to the threaded contact surface, slowing down the preload decay rate.

[0034] The top of the rubber seat 9 fits against the inner wall of the top of the tray 6, and a through hole is provided in the center of the rubber seat 9 for the screw 1 to pass through. The fit between the top of the rubber seat 9 and the inner wall of the top of the tray 6 forms a complete upper and lower buffer cavity, which restricts the elastic deformation of the rubber seat 9 within the tray 6 and avoids excessive deformation failure. The central through hole ensures that the rubber seat 9 can be assembled along the axis of the screw 1, and at the same time, the inner wall of the through hole fits against the surface of the screw 1, forming a flexible wrapping, reducing the radial sway of the screw 1 during vibration. This improves the overall vibration resistance and stability, and prevents the rubber seat 9 from detaching from the mounting cavity due to vibration. The central through hole provides flexible constraint on the screw 1, reducing the radial displacement of the screw 1, thereby reducing the relative slippage of the threaded contact surface. At the same time, the flexible wrapping protects the threads of the screw 1 and reduces wear.

[0035] The diameters of the first washer 10, the second washer 11, and the third washer 12 increase sequentially. The sequentially increasing diameters of the first washer 10, the second washer 11, and the third washer 12 form a stepped radial limiting structure. The outer washer can limit the lateral displacement of the inner washer, and the stepped structure can disperse the radial pressure between the housing 6 and the outer wall of the rubber seat 9, avoiding component deformation caused by local pressure concentration.

[0036] The glue reservoir 13 is filled with threadlocker adhesive, and the glue outlet 14 is connected to the glue reservoir 13. Both the glue reservoir 13 and the glue outlet 14 are arranged in a ring shape inside the rubber seat 9. During vibration, the rubber seat 9 undergoes elastic deformation, squeezing the internal glue reservoir 13, causing the threadlocker adhesive in the reservoir to overflow evenly through the annular glue outlet 14 onto the threaded contact surface of the screw 1. The annular design ensures that the threadlocker adhesive can fully cover the threads around the screw 1, and after curing, it tightly bonds the threads of the screw 1 and the nuts 2 and 3, forming an irreversible locking structure. The overflow and curing of the threadlocker adhesive fundamentally prevents the relative slippage of the threaded contact surface, solving the core problem of loosening caused by vibration. The annular glue reservoir 13 and the glue outlet 14 ensure that the threadlocker adhesive is applied evenly without any dead corners, maintaining the locking force of the threaded connection for a long time and preventing the preload from being gradually lost due to vibration.

[0037] There are multiple glue storage tanks 13, which are arranged vertically at equal intervals inside the rubber seat 9. These multiple vertically arranged glue storage tanks 13 can store a sufficient amount of threadlocker adhesive. During vibration, the multi-layer deformation of the rubber seat 9 will sequentially squeeze each layer of glue storage tank 13, achieving layered release of the threadlocker adhesive. The equal-distance arrangement ensures that thread sections at different heights of the screw 1 receive uniform coverage with threadlocker adhesive. The multi-layered glue storage tanks 13 extend the release cycle of the threadlocker adhesive, achieving long-term anti-loosening and preventing the loss of locking effect after the adhesive in a single layer of glue storage tank 13 is exhausted. The equal-distance arrangement ensures that the entire length of the thread is locked with threadlocker adhesive, completely eliminating the risk of slippage caused by partial lack of adhesive in the thread, and further ensuring the stability of the preload.

[0038] A rubber pad 8 is provided on the top outer wall of the tray 6. The inner wall of the rubber pad 8 is in contact with the outer wall of the contact area of ​​the tray 6, and the top surface of the rubber pad 8 is higher than the top surface of the tray 6. The rubber pad 8, in contact with the top outer wall of the tray 6, uses its own flexible properties to buffer the vibration pressure transmitted by the flat gasket 7. The top surface of the rubber pad 8 is higher than the top surface of the tray 6, so that the pressure of the flat gasket 7 acts on the rubber pad 8 first. The elastic deformation of the rubber pad 8 absorbs the impact energy, avoiding a hard collision between the flat gasket 7 and the tray 6. The rubber pad 8 achieves secondary buffering of vibration energy, further weakening the alternating load transmitted to the threaded contact surface. The design of being higher than the top surface of the tray 6 reduces the wear of the flat gasket 7 and the tray 6, extending the service life of the components. At the same time, the flexible buffer can stabilize the position of the flat gasket 7, avoiding uneven pressure caused by its displacement during vibration.

[0039] The first nut 2 and the second nut 3 are of the same specifications and model. The first nut 2 and the second nut 3 are provided with nylon sleeves inside the threaded rings. The first nut 2 and the second nut 3 of the same specifications form a double nut locking structure. After tightening, the two generate opposite preload forces, which restrain each other and counteract the loosening torque generated during vibration. The nylon sleeves inside the threaded rings are elastic. When tightened, the nylon sleeves are squeezed and deformed, filling the thread gap and increasing the frictional resistance of the thread surface, forming a preliminary anti-loosening barrier.

[0040] This invention utilizes the reverse preload of double nuts to form a basic anti-loosening structure. A nylon sleeve is placed inside the nut to fill the thread gap, increasing frictional resistance and suppressing relative rotation of the threads. A multi-layered vibration energy absorption system is constructed through the frustum-shaped structure of the rubber seat 9, the hemispherical shell design of the concave plate 6, and the flexible buffering of the rubber pad 8. The alternating load generated by vibration is dissipated step by step through the elastic deformation of the rubber seat 9, the buffering of the rubber pad 8, and the rebound of the spring washer 4, significantly reducing the impact force transmitted to the threaded contact surface, reducing thread wear and stress concentration. During the compression process of the rubber seat 9, the internal glue reservoir 13 releases thread-locking glue, which, after curing, irreversibly bonds the threads of the screw 1 and the nut, preventing slippage and avoiding the gradual attenuation of preload due to vibration. This solves the problem of the traditional fastener's anti-loosening effect decaying over time, significantly improving the service life and operational reliability of fasteners under long-term vibration environments.

[0041] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A seismic-resistant fastener, comprising: The screw (1) is characterized in that: a first nut (2) and a second nut (3) are provided on the outside of the screw (1), a bottom washer (5) is provided on the top of the second nut (3), a tray (6) is provided on the top of the bottom washer (5), a rubber seat (9) is provided inside the tray (6), a flat washer (7) is provided on the top of the tray (6), a spring washer (4) is provided on the top of the flat washer (7), a glue storage groove (13) is provided on the inner wall of the rubber seat (9), a glue outlet (14) is provided on the threaded side of the glue storage groove (13) near the screw (1), and a first washer (10), a second washer (11) and a third washer (12) are provided between the outer wall of the tray (6) and the rubber seat (9).

2. The anti-vibration fastener according to claim 1, characterized in that: The bottom gasket (5) is surrounded by retaining rings. The tray (6) is hemispherical in shape. The bottom of the tray (6) is provided with a flange. The bottom flange of the tray (6) is in contact with the top surface of the bottom gasket (5).

3. The anti-vibration fastener according to claim 1, characterized in that: The top of the tray (6) has a through hole for the screw (1) to pass through.

4. The anti-vibration fastener according to claim 1, characterized in that: The rubber seat (9) is a frustum-shaped structure with a small top diameter and a large bottom diameter. The bottom of the rubber seat (9) is provided with a rubber flange, which is in contact with the top surface of the bottom gasket (5).

5. The anti-vibration fastener according to claim 1, characterized in that: The top of the rubber seat (9) is in contact with the inner wall of the top of the tray (6), and a through hole for the screw (1) to pass through is provided in the center of the rubber seat (9).

6. The anti-vibration fastener according to claim 1, characterized in that: The diameters of the first washer (10), the second washer (11), and the third washer (12) increase sequentially.

7. The anti-vibration fastener according to claim 1, characterized in that: The glue storage tank (13) is filled with thread-locking glue, and the glue outlet (14) is connected to the glue storage tank (13). The glue storage tank (13) and the glue outlet (14) are both arranged in a ring inside the rubber seat (9).

8. The anti-vibration fastener according to claim 7, characterized in that: There are multiple rubber storage tanks (13), and the multiple rubber storage tanks (13) are arranged vertically at equal intervals inside the rubber seat (9).

9. A seismic fastener according to claim 5, characterized in that: The outer wall of the top of the tray (6) is provided with a rubber pad (8), the inner wall of the rubber pad (8) is in contact with the outer wall of the contact part of the tray (6), and the top surface of the rubber pad (8) is higher than the top surface of the tray (6).

10. The anti-vibration fastener according to claim 1, characterized in that: The first nut (2) and the second nut (3) have the same specifications and model. The first nut (2) and the second nut (3) are provided with nylon sleeves inside the threaded rings.

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